Aging amorphous/crystalline heterophase PdCu nanosheets for catalytic reactions

• 来源期刊: 国家科学评论（英文版）
• 关键词: amorphous/crystalline heterophase nanosheets aging selective hydrogenation catalysis
• 年，卷（期）: 2019,（5）
• 页码范围: 955-961
• 页数: 7页
• 语种: 英文
• DOI: 10.1093/nsr/nwz078

摘要

Phase engineering is arising as an attractive strategy to tune the properties and functionalities of nanomaterials.In particular,amorphous/crystalline heterophase nanostructures have exhibited some intriguing properties.Herein,the one-pot wet-chemical synthesis of two types of amorphous/crystalline heterophase PdCu nanosheets is reported,in which one is amorphous phase-dominant and the other one is crystalline phase-dominant.Then the aging process of the synthesized PdCu nanosheets is studied,during which their crystallinity increases,accompanied by changes in some physicochemical properties.As a proof-of-concept application,their aging effect on catalytic hydrogenation of 4-nitrostyrene is investigated.As a result,the amorphous phase-dominant nanosheets initially show excellent chemoselectivity.After aging for 14 days,their catalytic activity is higher than that of crystalline phase-dominant nanosheets.This work demonstrates the intriguing properties of heterophase nanostructures,providing a new platform for future studies on the regulation of functionalities and applications ofnanomaterials by phase engineering.